<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>073-全局执行环境.html</title>
	<script>
		var a = 1;
		function showName(){
		console.log("chris");
		function showAge(){
			console.log("my age is 18");
			}
		}	
		console.log(window);
		//window.alert("hello");
		
		console.log(window.a === a);
		window.showName();
		console.log(window.showName);
		console.log(window.showAge);
	</script>
</head>
<body>
	
</body>
</html>